v0.12.0

We are pleased to announce version 0.12.0 of ACHE Crawler!

Following is a detailed log of the changes since the last version:

• Upgrade crawler-commons dependency to version 0.9
• Removed Elasticsearch transport-client-based repository
• Removed Elasticsearch 1.4.4 binaries dependency
• Added DumpDataFromElasticsearch tool for dumping documents from Elasticsearch
  repositories
• Added configuration for minimum relevance in link selectors
• Added configuration for selecting whether should re-crawl sitemaps and
  robots.txt links
• Added documentaion about relevance_threshold parameters to the target page
  classifiers documentation page
• Added support for crawling via HTTP proxy in okhttp3 fetcher (by @maqzi)
• Added tracking of more HTTP error messages (301, 302, 3xx, 402) (by @maqzi)
• Upgrade crawler-commons library to version 1.0
• Upgrade commons-validator library to version 1.6
• Upgrade okhttp3 library to version 3.14.0
• Fix issue #177: Links from recent TLDs are considered invalid
• Upgrade RocksDB dependency (rocksdbjni) to version 6.2.2
• Added error code details to RocksDB exception logs
• Upgrade gradle-node-plugin to version 1.3.1
• Upgrade npm version to 6.10.2
• Upgrade ache-dashboard npm dependencies
• Upgrade gradle wrapper to version 5.6.1
• Update Dockerfile to use openjdk:11-jdk (Java 11)
• Added content_type field to RegexTargetClassifier
• Change default link classifier to LinkClassifierBreadthSearch
• Update io.airlift:airline dependency to version 0.8
• Update gradle build script to use new plugins DSL
• Update coverals gradle plugin to version 2.9.0
• Update searchkit to version ^2.4.0